On a vu des chevaux sauvages pendant nos vacances.

We saw wild horses during our vacation.

Il ne vient jamais aux soirées, il est un peu sauvage.

He never comes to parties; he's a bit unsociable/shy.

C'était une attaque sauvage.

It was a brutal/violent attack.

Il a dit qu'on les traitait comme des sauvages.

He said they were being treated like savages.